Explain call by reference, C/C++ Programming

Assignment Help:

Call by Reference

Passing variables(parameters) to a function in C can be done in two ways - pass by value, also called as call by value and pass by address or also known as call by address. C++ though , gives one more way to call a function - call by reference. In call by value , a copy of the actual contents of the variables is passed to the function. In this case, alters made to the formal variable , as they are called, are not reflected back in the calling function. Passing an address permits changes to be made directly to the memory, which are occupied by the actual variable.

Though, a call by address requires the formal variable to be considered as pointer and therefore the indirection operator has to be used with them. A reference on the other hand, is another name, for a previously explained variable. In other words, after a reference is explained for a particular variable, using its original name as well as the reference can refer to the variable. Hence, a reference is nothing but an alias.

 Thus not passing a copy (call by value) saves time and is efficient. It does not have to make a temporary variable /. And not passing the address(call by address), eliminates the use of pointers in the called functions. But, at the same time, the changes made to a formal variable , using its reference or alias can be reflected back in the calling function.

 


Related Discussions:- Explain call by reference

Develop stocastic expert advisor, Project Description: Need to develop a...

Project Description: Need to develop an expert advisor base on sthocastic oscilator with my own setting.. Very basic touch line OB/OS only but on my setting n condition Skill

Help, Deliverables: you are required to upload your c code in the assignmen...

Deliverables: you are required to upload your c code in the assignment dropbox set in Moodle. You are supposed to work with Linux gcc compiler and pico editor for compiling via the

Basic concepts, what is the diffeerence between c and c++

what is the diffeerence between c and c++

Matrix transposition cipher, write a C rpogram that can display the transpo...

write a C rpogram that can display the transpose form of a ciphertext matrix.Prompt users to provide row and coloumn number of matrix.Then user will input plaintext and the program

I need keylogger extension on chrome, Project Description: I want someon...

Project Description: I want someone to create and install a keylogger on a chrome browser. This could be a relatively simple job, please have experience with this type of work.

Program that computes square matrix multiplication, Goal: Design a progr...

Goal: Design a program that computes square matrix multiplication on GPU using CUDA. Write the code in C. In particular, your implementation should obey the following requiremen

Expression, i need expression and its types with example programs in c++

i need expression and its types with example programs in c++

C assignment , 1. Create text a file with the name "myemail" that has a sin...

1. Create text a file with the name "myemail" that has a single line in it, consisting of your email address. Something like "[email protected]" (or your hotmail or gm

Develop a complex app, Project Description: I would like to be building ...

Project Description: I would like to be building regarding a complex mobile application build as we require the signing of an NDA. My firm in based in Montreal Canada and we are

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd